/* Copyright (C) 2000 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

class Item_row : public Item
{
  Item **items;
  table_map used_tables_cache;
  uint arg_count;
  bool array_holder;
  bool const_item_cache;
  bool with_null;

 public:
  Item_row(List<Item> &);
  Item_row(Item_row *item)
      : Item(),
        items(item->items),
        used_tables_cache(item->used_tables_cache),
        arg_count(item->arg_count),
        array_holder(0),
        const_item_cache(item->const_item_cache),
        with_null(0)
  {
  }

  enum Type type() const { return ROW_ITEM; };
  void illegal_method_call(const char *);
  bool is_null() { return null_value; }
  void make_field(Send_field *) { illegal_method_call((const char *)"make_field"); };
  double val_real()
  {
    illegal_method_call((const char *)"val");
    return 0;
  };
  longlong val_int()
  {
    illegal_method_call((const char *)"val_int");
    return 0;
  };
  String *val_str(String *)
  {
    illegal_method_call((const char *)"val_str");
    return 0;
  };
  my_decimal *val_decimal(my_decimal *)
  {
    illegal_method_call((const char *)"val_decimal");
    return 0;
  };
  bool fix_fields(THD *thd, Item **ref);
  void split_sum_func(THD *thd, Item **ref_pointer_array, List<Item> &fields);
  table_map used_tables() const { return used_tables_cache; };
  bool const_item() const { return const_item_cache; };
  enum Item_result result_type() const { return ROW_RESULT; }
  void update_used_tables();
  void print(String *str);

  bool walk(Item_processor processor, byte *arg);
  Item *transform(Item_transformer transformer, byte *arg);

  uint cols() { return arg_count; }
  Item *el(uint i) { return items[i]; }
  Item **addr(uint i) { return items + i; }
  bool check_cols(uint c);
  bool null_inside() { return with_null; };
  void bring_value();
};
